I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

"Dan/W4NTI" wrote in message
k.net...
I am putting up my old TA-33SR by Mosley. I need to know how many
windings
are needed on the choke. I seem to remember 6" diameter, but not
the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

===================================
Dan, I am unable to help you.

Because, in common with most other people, I havn't the foggiest idea
what a TA-33SR is.

Questioners would do better by not depending on other people's
imagination. It takes only a few seconds to provide a little more
essential information. If you can't find the time then it can't matter
very much anyway.
----
Reg.

I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

===================================
Dan, I am unable to help you.

Because, in common with most other people, I havn't the foggiest idea
what a TA-33SR is.

Questioners would do better by not depending on other people's
imagination. It takes only a few seconds to provide a little more
essential information. If you can't find the time then it can't matter
very much anyway.

Reg, even to me (a relative newbie) "Mosley TA-33SR" provides all of
the information needed to identify what Dan is talking about. A very
brief Google identifies as a triband trap beam. I have little doubt
that anyone who has ever owned one (and is thus likely to have the
direct information that Dan is looking for) would recognize it from
his description with no further description being required.

Dan - since Mosely's manual doesn't mention such a choke, and the
instruction sheet indicates a direct attachment of the coax to the
driven-element feedpoint terminals, I doubt that the details of the
choke are terribly critical. You could probably use any of the plans
on the net for an air-wound coaxial choke-balun. One plan I see uses
18-21 feet of coax, close-wound solenoid-style on a 5" PVC form
(stated to be good for 160-10 meters).

Another site (http://www.bcdxc.org/balun_information.htm#Ed,%20WA2SRQ)
has a table of air-core balun impedances, as a function of both
frequency and construction (turn count and diameter). This chart
suggests to me that 4 turns, 6 5/8" solenoid-wound might be a good
option for you, as its impedance peaks at around the 15-meter band and
is 500 ohms or better between 10 and 20 meters.

Some folks seem to prefer solenoid-wound air baluns, others prefer
scramble-wound. There seems to be a fair bit of disagreement as to
which style works better, and why.

The other choices are to use a different sort of balun (e.g. a W2DU
ferrite-bead choke), or none at all.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

"Dave Platt" wrote in message
...
I am putting up my old TA-33SR by Mosley. I need to know how
many windings
are needed on the choke. I seem to remember 6" diameter, but
not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

===================================
Dan, I am unable to help you.

Because, in common with most other people, I havn't the foggiest
idea
what a TA-33SR is.

Questioners would do better by not depending on other people's
imagination. It takes only a few seconds to provide a little more
essential information. If you can't find the time then it can't
matter
very much anyway.

Reg, even to me (a relative newbie) "Mosley TA-33SR" provides all of
the information needed to identify what Dan is talking about. A
very
brief Google identifies as a triband trap beam. I have little doubt
that anyone who has ever owned one (and is thus likely to have the
direct information that Dan is looking for) would recognize it from
his description with no further description being required.

Dan - since Mosely's manual doesn't mention such a choke, and the
instruction sheet indicates a direct attachment of the coax to the
driven-element feedpoint terminals, I doubt that the details of the
choke are terribly critical. You could probably use any of the
plans
on the net for an air-wound coaxial choke-balun. One plan I see
uses
18-21 feet of coax, close-wound solenoid-style on a 5" PVC form
(stated to be good for 160-10 meters).

Another site
(http://www.bcdxc.org/balun_information.htm#Ed,%20WA2SRQ)
has a table of air-core balun impedances, as a function of both
frequency and construction (turn count and diameter). This chart
suggests to me that 4 turns, 6 5/8" solenoid-wound might be a good
option for you, as its impedance peaks at around the 15-meter band
and
is 500 ohms or better between 10 and 20 meters.

Some folks seem to prefer solenoid-wound air baluns, others prefer
scramble-wound. There seems to be a fair bit of disagreement as to
which style works better, and why.

The other choices are to use a different sort of balun (e.g. a W2DU
ferrite-bead choke), or none at all.

--
Dave Platt
==================================

Dave, having learned from you, a newbie, not from the enquirer, what a
TA-33SR is, and having inspected the website you specify, I am a
little wiser from reading the baffle-gab.

I agree with your recomendations. Just get a hank of coax, suspend it
in the feedline and away you go.

But it may be more mechanically convenient and electrically better to
wind a few turns of coax or Radio Shack twin speaker wire around a
ferrite toroidal core.

Or possibly do without a balun altogether. Try it and see what
happens. It's so easy to do.
----
Reg.

On Mon, 22 Aug 2005 22:34:59 +0000 (UTC), Reg Edwards wrote:

"Dan/W4NTI" wrote in message
k.net...
I am putting up my old TA-33SR by Mosley. I need to know how many
windings are needed on the choke. I seem to remember 6" diameter,
but not the amount of windings.
According to the manual there is no choke indicated at all.
Anyone know anything about this?

Dan/W4NTI

===================================
Dan, I am unable to help you.

Because, in common with most other people, I havn't the foggiest idea
what a TA-33SR is.

Then, by the criteria set in his question:
"Anyone know anything about this?",
you are unqualified to reply to his post -- and, should not have.

Dan,

As a couple of other fellers stated, I, too, am unconvinced that the
family of 3-el tribanders (the Mosely TA-33, the Cushcraft A3S, etc.)
are very much affected by the presense, or lack of a choke balun.
I've operated my CC A3S both ways and am unable to distinguish a smidgen
of difference.

For a multi-element monobander...., well .....

Just insure you've got a "50 ohm source" and a "50 ohm transmission line"
to feed your "50 ohm load" and you should be a happy operator. At
least it will work well enough to keep you On The Air, and keep
you off of usenet and out of rraa where publicly anguishing over your
concerns usually results in abuse by the resident stalkers.

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
Pueblo, Colorado | @ config.com | Jonesy | OS/2
*** Now killfiling all X-Trace: posting.google.com followups

"Reg Edwards" wrote in message
...

"Dan/W4NTI" wrote in message
k.net...
I am putting up my old TA-33SR by Mosley. I need to know how many
windings
are needed on the choke. I seem to remember 6" diameter, but not
the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

===================================
Dan, I am unable to help you.

Because, in common with most other people, I havn't the foggiest idea
what a TA-33SR is.

Questioners would do better by not depending on other people's
imagination. It takes only a few seconds to provide a little more
essential information. If you can't find the time then it can't matter
very much anyway.
----
Reg.



Then perhaps it would be better if you didn't respond at all, eh?

Dan/W4NTI

Dan:

Look he
http://bama.edebris.com/manuals/mosley/ta33sr

at the files:
00readme.txt (72 bytes)
ta33sr.pdf (322 KB)

John

On Mon, 22 Aug 2005 21:59:28 +0000, Dan/W4NTI wrote:

I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

I was thinking more of contacting larry at:



.... my thinking being, since he supplied the manual and his email, he most
likely would have seen that question, owned the beam and familiar with the
construction of the choke/balun...

John

On Mon, 22 Aug 2005 21:59:28 +0000, Dan/W4NTI wrote:

I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

Dan/W4NTI wrote:
I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI

Hi Dan, The choke on a 3 band Yagi is to decrease feedline
radiation, a choke balun. If you don't use a choke balun, you could
have some pattern distortion, it would deviate from the classical 3
element Yagi pattern.
I think the rule of thumb is have enough chocking impedance on the
lowest band (20M) so that it is 10X the antenna impedance (50 ohm).
You wind your coax into a coil that will accomplish this.
The TA-33's that I have seen did not have the choke balun. In casual
Amateur operation of the TA-33 I doubt you would miss the choke, or
know if it was there or not.
Gary N4AST

Dan/W4NTI wrote:
I am putting up my old TA-33SR by Mosley. I need to know how many windings
are needed on the choke. I seem to remember 6" diameter, but not the
amount of windings.

According to the manual there is no choke indicated at all.

Anyone know anything about this?

Dan/W4NTI


My TA-33 manual calls for 5 turns at 6 inch diameter
Bill, W3FI